Signal interference in a long cable

From: Michał Pleban <*lists_at_michau.name*> Date: Wed, 21 Dec 2016 19:51:05 +0100 Message-ID: <585ACF19.1060709@michau.name> · lists_at_michau.name

Hello!

I am fighting with signal interference in a long cable. I have clock and
data signals, plus some others too (they come from the C65 to the 1565
drive).

The signals interfere with each other, causing the clock signal to look
like this:

http://i68.tinypic.com/nqqth.jpg

The longer the cable, the worse the signal distortion. The distorted
clock signal confuses the shift register, making it shift some unwanted
bits and causing corruption of the received data.

I tried some simple stuff like termination but it didn't really change
anything. Passing the clock signal via some receiver circuit (for
example, 7414 Schmitt trigger gate, or a 75182 line receiver) helps
*somewhat*, but with a long enough cable (over 1 meter) the distortions
become too big to filter them out this way.

I am not very goot at analog stuff, so I would appreciate any pointers
to what can be done with this?

Regards,
Michau.

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